The 16-year-old girl was in critical condition late Wednesday afternoon with a head injury. Police say she was walking in the crosswalk at Elizabeth St. with the right of way when she was hit at approximately 7:07 a.m.

Police believe the vehicle was being driven by a woman. Earlier police released a partial license plate, but later retracted that description because it may not have been accurate.

At a late afternoon news conference, investigators showed a piece of the vehicle that hit her, as well as surveillance video of the car hitting her and then continuing to drive away.Police released it in hopes that someone will recognize the car and call them.

The girl was one of two students hit by a vehicle in separate incidents on Colfax Wednesday morning.

East High School posted a letter to parents on the school's website from Principal Andy Mendelsberg saying "Our thoughts and well-wishes are with this student as she recovers from her injuries."

Medina Alerts were created in 2012 and are named after 21-year-old valet Jose Medina, who as killed by a hit-and-run driver in January 2011.

A taxi cab driver followed the vehicle that hit Medina and reported it to police, eventually leading to an arrest.

The program alerts police officers as well as taxi cabs, truck drivers, pedicab operators, and news outlets to be on the lookout for the suspected vehicle.

WARNING: The video below is graphic. It is surveillance camera video of the hit-and-run vehicle hitting the East High School student.